munirabbasi Posted November 11, 2020 Share Posted November 11, 2020 Hello Avionic expertise Frequency sensitive relays of C-130 are supplied by AC generator Phase C on "AC" point its TB . The Query is raised in my mind that why phase "B" or A is not supply from the generator for frequency monitorin g of the system. Best Regards Munir Abbasi Home Hercules Pakistan Quote Link to comment Share on other sites More sharing options...
hehe Posted November 11, 2020 Share Posted November 11, 2020 If electricity sequence is A-B-C, I would assume that you would check C phase because it is the last phase of the sequence. If last phase has correct frequency, the other 2 (A-B) should as well. Just my thought on it. You would have to ask the electrical engineers that designed it to be sure. Quote Link to comment Share on other sites More sharing options...
tinyclark Posted November 11, 2020 Share Posted November 11, 2020 Munir, since it makes no difference which phase is monitored, any phase could be used. I have no idea why they chose phase C. Maybe the relay was closer to a phase C connection. The only person that probably knows is the engineer who designed it back in the 1950's. Sometimes, I think you think too much about these details. 😅 Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted November 12, 2020 Author Share Posted November 12, 2020 5 hours ago, hehe said: If electricity sequence is A-B-C, I would assume that you would check C phase because it is the last phase of the sequence. If last phase has correct frequency, the other 2 (A-B) should as well. Just my thought on it. You would have to ask the electrical engineers that designed it to be sure. Thanks Best Regards Munir Abbasi Quote Link to comment Share on other sites More sharing options...
munirabbasi Posted November 12, 2020 Author Share Posted November 12, 2020 5 hours ago, hehe said: If electricity sequence is A-B-C, I would assume that you would check C phase because it is the last phase of the sequence. If last phase has correct frequency, the other 2 (A-B) should as well. Just my thought on it. You would have to ask the electrical engineers that designed it to be sure. My dear brother I agree with you Thanks Best Regards Munir Abbasi home Hercules Pakistan 1 Quote Link to comment Share on other sites More sharing options...
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